you probably want to get an xray. if your sacrum is tilted, you want to do certain stretches, if its compressed nerves, you want to do other stretches...... yoga has answers for all that shi t, forget the chiro.

in the meantime, don't keep neglecting your back and core. you must do exercises like supermans, tabletops, back extensions (u can use a ball if you have access instead of the machine), good mornings (if you dont have barbell access, just put something on your back)